img

官方微信

高级检索

中国沙漠 ›› 2009, Vol. 29 ›› Issue (5): 785-795.

• 沙漠与沙漠化 •    下一篇

科尔沁沙地不同尺度上沙丘景观格局动态变化分析

左小安1, 赵哈林1, 赵学勇1, 常学礼2, 郭轶瑞1, 张继平2, 李健英2   

  1. 1.中国科学院 寒区旱区环境与工程研究所 奈曼沙漠化研究站, 甘肃 兰州 730000; 2.鲁东大学 地理与资源管理学院, 山东 烟台 264025
  • 收稿日期:2008-08-05 修回日期:2009-02-27 出版日期:2009-09-07 发布日期:2009-09-07

Changes on Landscape Pattern of Sand Dunes at Different Scales in Horqin Sandy Land

ZUO Xiao-an1, ZHAO Ha-lin1, ZHAO Xue-yong1, CHANG Xue-li2,
GUO Yi-rui1, ZHANG Ji-ping2, LI Jian-ying2
  

  1. 1.Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, China; 2.College of Geography and Resource Management, Ludong University, Yantai 264025, Shandong, China
  • Received:2008-08-05 Revised:2009-02-27 Online:2009-09-07 Published:2009-09-07

摘要: 研究了科尔沁沙地过去30 a不同尺度上沙丘景观格局及其动态变化。结果表明,大尺度研究区(892.74 km2)从1975—1995年流动沙丘面积、斑块数、景观面积百分比和最大斑块指数逐渐增加;1995—2005年流动和半流动沙丘面积减小,半固定沙丘和固定沙丘面积增加。中尺度(110.42 km2)和小尺度(14.14 km2和14.10 km2)研究区从1975—1985年流动沙丘面积、斑块数增加,1985年后流沙面积减小。通过沙漠化过程指数计算表明,大尺度上沙漠化经历了发展(1975—1995年)—逆转(1995—2005年)的过程,中尺度和小尺度上,沙漠化经历了发展(1975—1985年)—逆转(1985—2005年)的过程。科尔沁沙地不同尺度上景观结构变化具有差异性,显示出景观空间格局变化存在尺度效应;景观格局变化主要受流动沙丘斑块变化的影响,而这一变化的主要原因是人类生产活动引起的。

关键词: 科尔沁沙地, 尺度, 沙丘, 景观格局, 沙漠化过程

Abstract: The present study provides an analysis on landscape pattern changes of sand dunes at different scales in Horqin Sandy Land. The resulted showed that the areas, patch numbers, landscape area percent and largest patch index of mobile dune at larger scale (892.74 km2) increased gradually from 1975 to 1995, but the areas of mobile dune and semi-mobile dune decreased after 1995. The areas and patch numbers of mobile dune at medium (110.42 km2) and small scales (14.14 km2 or 14.10 km2) increased from 1975 to 1985, but they decreased after 1985. The analysis of the index and value of desertification process indicated that the desertified lands at larger scale are in the development process of desertification from 1975 to 1995 and are in the reversion process after 1995, and the desertified lands at medium and small scales, are in the development process of desertification from 1975 to 1985 and are in the reversion process after 1985. The study scales had an important effect on the changes of spatial landscape pattern in the sandy land. The changes of landscape pattern of Horqin Sandy Land are determined mainly by the changes of numbers and areas of mobile dunes resulted from the unsuitable human activities.

Key words: Horqin Sandy Land, scale, sand dune, landscape pattern, desertification process

中图分类号: